When using the 'fields' parameter I'm getting an error.

[bigoper]

When using the 'fields' parameter I'm getting an error.

This is the error:
Notice: Undefined property: Phalcon\Mvc\Model\Row::$PropertyType in /var/app/current/vendor/redound/phalcon-rest/src/PhalconRest/Transformers/ModelTransformer.php on line 129
Notice: Undefined property: Phalcon\Mvc\Model\Row::$5thBedroomDimensions in /var/app/current/vendor/redound/phalcon-rest/src/PhalconRest/Transformers/ModelTransformer.php on line 129
Notice: Undefined property: Phalcon\Mvc\Model\Row::$ZipCode in /var/app/current/vendor/redound/phalcon-rest/src/PhalconRest/Transformers/ModelTransformer.php on line 129
Notice: Undefined property: Phalcon\Mvc\Model\Row::$ZipCodeLast4Digits in /var/app/current/vendor/redound/phalcon-rest/src/PhalconRest/Transformers/ModelTransformer.php on line 129
Notice: Undefined property: Phalcon\Mvc\Model\Row::$CoListingAgentName in /var/app/current/vendor/redound/phalcon-rest/src/PhalconRest/Transformers/ModelTransformer.php on line 129
Notice: Undefined property: Phalcon\Mvc\Model\Row::$AgentsOfficeExtension in /var/app/current/vendor/redound/phalcon-rest/src/PhalconRest/Transformers/ModelTransformer.php on line 129
Notice: Undefined property: Phalcon\Mvc\Model\Row::$AgentPhone in /var/app/current/vendor/redound/phalcon-rest/src/PhalconRest/Transformers/ModelTransformer.php on line 129
Notice: Undefined property: Phalcon\Mvc\Model\Row::$Area in /var/app/current/vendor/redound/phalcon-rest/src/PhalconRest/Transformers/ModelTransformer.php on line 129 
Notice: Undefined property: Phalcon\Mvc\Model\Row::$AssocFeePaidPer in /var/app/current/vendor/redound/phalcon-rest/src/PhalconRest/Transformers/ModelTransformer.php on line 129

the mentioned error repeats it self all over the page, but with diff 'property'.
?fields=known_field
2. when entering a non exist value in the 'fields' param, I'm getting an 'OK' error. (expected)
?fields=un_known_value
3. when entering an unknown type of 'param', I'm getting an 'OK' error (expected)
?un_known_fields=value

I need to resolve issue 1.

Thanks,
A.I